Valve for hot-blast stoves.



of iVheeling, in the county of Ohio *and i 'theinventionmore?particularly relates' to u noise heretofore made in-relieving the air work, ami, as .all other tion-for burnin gase's inthe stoves to re-' hea't 'the stove c eckerwork. provide-a hot-blaststovehavngnoiel means '15 to 35 pounds -per squarefincln 80 binedchinmey and blow-ofl yalve for ue after bein hot-blas't stbves.

reduoed to that of the atn'osphere' 'the provision on e hot-blast stoveof the UNITED STATES PATENT? TEOMAS L. DONAHIE, or wnnELmG, WEST mann&

VALVE ron HOT-BLAST s''ovs i Specication of Letters Intelit.PateihdMtIZ, '1918.

' *Appliationflled J'1y 1, 1917. Serial Ne. 179364.

To all whom 'it may cana-em: e' type, wherein' the "chimiey :up ona-mgBe it lmojvn that I, THOMAB L. DONAHIE, and connected to' the interior,of'. sto? a citizen of the United States, and 'resident at the top orupper end of the Stov'e.

Heretofore t has -been -the prat ce. State of WVest Virginia, haveinvented cerposition the chimney v'alve ;mfipommd t'ain new and usefulImprovementsinValves cent to that at which the chinney is con forHot-Biast Stove, of which the foliowneoted to the interier of the-shiti'And; in .is a specifiction. e far as' I am awere; he etofore,` yinvention relate's to the construction the universal practice td ositionthe ireand arra'ngement of the valves forming 'part lief or blow-offvalve of "bt blast 'stovesiatl of theequiprnent of hot-blast stoves, anda point ndjacent to .the gro nd ievel.

When a given quentity -ofoold blat is i introduced into .the stovet`o`.hedbdfi -"iald heated is. cau' sed ;to pass on hot blast stoires e e-`t. "sto've into the hot-blast main, theflsto es One object ofthie`invention is to provide ohec work will have given up' so m'ch' ofq'manovelco'n'binati'on of :valves for use with .its heet o the air thatoitmust' dga'injbeey j heeted; Theupon the hot blast andold V Anotherobject of my invention is to prcr blast' valves on thestove are closed"te k tpen" ,ii`t" th 18 stove includng thatfcls by chimny' velve havebeen tightly' shut while i the-'air blest, the sto've of hir"- A'further ;object of my invention is to which is oompressed, to a 'preshrof the Construction and' arrangement of a comvide means for; preventingthe' excessive v lminary to again heating the store presente in 'suchhot-blast stoves in preparefore,- it isnecessa .to lesenthep'es'urexof-; in the stove after eacR- blast `o`- air heating `the arconflnedythir the Stve nd edueeoperation is released, andthe pressn'e-ofthe k t to atmosphenepressure befor -th z mm ar iconfinedwithin thestoveafter each-air bus t1 ble blast fu'rnaoe 'gases can be or blast heatingopertion, is lessened' and npphedto the stove n 'order *ton in' ea e i ithstove checkerwork to the requred-high A still further object of myinventionis temperature'. f

` The chimney valve on-suoh stovesi com: 'aratively large, in 'theparticular cae shown being about' 48 inchee efiectivdiineter, and asthe. valve 'moves inwardlyin opcning, it will be'readily seen"that &wery'considerabl --force is, required in' order to hot-blat stoves ereregenemtive, open 'the chimney vlve againstf'th 15 ,-.to' i .the 35pounds air pressirewithin the" -stove.. 05

roducts Heretoore, a. small airr'elief valvey loc ted stoveat thebottom, of 'the stove .near the -floo 1 whereby .the .compressed airremaining with-- novel c'onstructions, combinations, endenraigemcnt ofparts shown in the drawinis. to be fully described hereinafter and toparticularly pointed out in theappended claims.

The' biast. furnacegases being burned stove combustion chamber-, and theof combustion passing through t e heckem'ork inthei; travel `to the'stove level, has been' emplo ed, this `ve1ve` being chimney throughwhich the burned gases opened to relieve the hgh 'irgpresre' with aredischar'ged into the atmosphere at a coniri the stove and, byfpermittingtheconfined sidera-ble elevation above the .ground level. air to escapeiitothe atmosphere; to reduce The cold blast" or 'compressed air is thenthe air pre'ssur'e within the stove'to'that of forced through the stove,generally in the the atmosphere. When this air re'lief valve oppositedirection, the -two Operations not is first opened the compressed 'airconfined occurring at the same time. `within the stove rushes forth witha. tcrrific'lo While not limited to such use., my invenroar, and the.valve being small, so as to tion is particularly adapted for on hotpermit of it being readily opened,.some hhst stoves of the Masicks andCrookes little time elapses before the pressure in the convenient pointat the stove. isreduced to that of the atmosphere,

so that the noise caused by the escaping air continues for some time.

y With my novel Construction and arrange- 5 ment'of valves the reliefvalve is combined with the chimney valve so that; when reducing the airpressnre within the stove after each air blast heating operation, theescap'- ing air is discharged into and throug stack on top 100 or morefeet, 60 feet hi her than the stove the excessive amount o noiseheretofo-e caused by-the escaping air is prevented or mufiled so that.its escape is not audible, does not create any e annoyance `'ordisturbance, and lessens the A danger to worknen in the immediatevicinityof the stove.

'By -eonbining the relief .valve neyl' valve, the cost of 'equippi'ngand maintuning the stove in, ope-ton s materially redueed, 'and by mynovelarrangement of and chim- -vlves within the ehimney or'stack of thei hot-'Mast stov the valves are automatinishit in closed position andare .ope'ted .in opening and closin groun l thelhceompanying d'wi'ngs,orrning e ol thipeciflation, Figure lis a seeshowing the upper end of jla-&#11 16 angli-enet. meet the stove Iofstckwth combined chimney-?ndi-reHeL-o'-I'blow-ofl 'valve con etedand si-rangedaanlmpplied for usen ceorglnce' with myt invention. Figflis seetonlelevetion' on &larger 5i showing 'delilsin the construct on el-;thy shu e vlve and 'valveoperatng' jQ'nech'mism thesectien beng taken on the Fig- L M: 4 I l 8'is' a sectionsl elevation takenon I a e' e III-r-IIIof Fi'g 1,' showinga deta'il i in construction of the valve opertng i! mecheisn. 4 a 2 Inthe accompan drawir'gs the numeral 2 designates the metal shell of a'hotblast stove of; the Maissicks {and Crookes type; having a combinedblow-ofi and chimney-valve, constructed and arranged and applied for usethereon' in eccordance with my invention. -The 'stove shell which hasthe, usual refractory central eombustion chamber. Mounted on top of thestove shell `2 isthe metal shell of the stove stack o' chimney which'also has a refractory linin 5 and removably secnred in the atack! atthe base thereof s a rem'ovable chimney valve seat 6 and mushroomchimney valve 7; The Construction c t-the valve seat in itself is.old.In my improved apparatus the valve -7 'has a central opening 8 therein:which forms ob the blow-oli or air-relief outlet-or the stove,

' which s arranged h the-` of the stove, at an elevaton of' surface ofthn chimney valve 7 to change its and as the stuck is 50 to ing againstthese links 15 beng connected to the swingg ;iver 16 is pivoted at an inits length by a pivot pin 17 to a bjracket .vided in [for that pur`which a wire rope or lining '3 is provided with checkerwork and a`vertical, axially a and Secured in position on the vertical axis of thechinney valve is a uppet valve 9 formin the air-relief or low-off valve,to co-act with and close the blow-ofl'outlet 8 in the chimney valve 7.

The stove 2 is provided with the usual cold-blast inlet formed of anelbow 10 which opens upwardly so that in entering the stove thecold-blastwill strike against the metal direction of how and in this wayavoid the highly' comprom'ed incoming air from strikthebri'ck work 11forming the refractory liing in the lower section 12 of the chimney iand the dome-shaped partition 13 above the stove combustion chamber.

It will be readily 'understood that streamsof air at a pressure of 15 to35 pounds by strikin eontinuously against the refractory lining n thestove would rapidly disintegrate the fire-clay or other refractorymaterial used in cementing the bricks forming the lining in building thereractory lini %he chjnney valve is provided with lugs 14, 14 on itsupper ace hy which it s pivotally connected to the links 15, 15 'fromwhich 'it is suspendeth the upper end' of end of the valve lever; 16..This'valv'e 05 termediate point 18 which s fastened to the adjacent.outer surface of the stove stack 4, the lever `pr0- jecting through aslot or-ope`ing19 prothe shell and liningof the stack -The outer end ofthis lever l-is provided with a counter weight 20 which is adjustablysecured thereon, and its outer swinging end hasa clevis 21 thereon byother 'flexible connection 22 is fastened to .the lever, this flexibleconnection depending downwardly to a point where it is easily grasped byen operater, so that b pulling on the flexible oonection the va ve 7will readily close.

It will be understood-that the' eounterweight 20 on the end of thelever16 is positioned in a manner which will only partly counter-balancethe weight of the va'lve so that this valve will pen byl gravity whenseat 6 so as to. prevent leakfe of air from ey w the stove 2 into thechi hile heating the hlast.

s 12'5 The pnppet valve 9' forming the air-relief ,valve is re'novablyseem-ed on one-end of a stem 23. The u per end of. this stern is piotliy connecbe to' the lower en'd of the lnka 24, 24, and the upp r endsof the links 130 one end thereof so esto yieldinglynaintain the puppetvalve 9 in closed ostion on`-its seat in the ehimney valve at all 24 arepivotally connected to au intermediate point in the length of theswinging lever 25. Thislever 25 is pivotall connected at one end by apin 26 to one end of the chimney valve Operating lever 16 (see Fig. l).

The air-reli'ef falve 'lever- 2-5 also extends' times except when it ispositively moved into open position through the medium of the rope 27and' lever 25. It will be noted thatthe Operating lever 25 for thepuppet air-relief valvc 9 being pivotally connected w'tardly below thelever 16 to which it is'.

fiexible 'cable 27 connected to the outer to one end of the swinginglever 16'f0r the chimney valve 7 the counter-weight 32 will maintainthe'air relief valve 9 in closed po-. sition in all' positions 'intowhich the chimiey valve 7 is moved, except when the valve 9 isheld :inopen position by means of th en of the air relief valve lever 25:

The w weight ever 29 is made to extend downrigidly. fastened sovas toform a guide -for the movable puppet valve lever 25.

The operaton of my improved apparatus Will'be readily understood. Whenthe hotblast stove is on air, z'. e., when the coldblast is being passedthrough the stove 2 in order to be heated therein the chimney valve 7and puppet or air-relief valve 9 will be in the closed position shown inFig. 1.

After the stove has been on blast z'. e., has been in use for such timeinterval as is required :for heating the checkerwork, the cold-blastvalve on the cold-blast main leading to the elbow 1-0 is closed, and'the hotblastvalve on the stve Vis closed to prevent the hot-blastfiowing'i backwardly' from the hot-blast main intofthe stove when theair withinfthe stove is rednced to atmospheric pressure.

After the hot and the cold-blast .valves have been closed, the operatorthen open s 5 the pppet relief valve 9 by pnllii'bn the cable onnectedto the enter 'en of the lever 25,`this operation moving the' val've 9dewnwardly against he pressureof the air now confined within hecoId-blast stove 2.

As the air within the stove is "at`15 to in'BO on arms 3Lwhich are' `neyvalve' leveris pilled by'.

ivot support; 30 for the counter-' asoas to' close the chmmey 'valve'onblast is turned on. I 'The openngs in the bottom of the stove '105' thenppe" end of the stove.

toi-ce required t/o completely open itis quickly lessened. When'thepuppet valve '9 is opened the air under pressure within 'the store thenrushes through the air-relief outlet S in the body' of the valve 7 andis discha'ged into the ehimney 4-., theair passing from the stove ntothe chimney until the air is reduced to the atmospheric pressure withinthe' stove.

Thereupon the chimney valve automatically opens as it isarranged toover-balance the counter-weight 20, the weight of the cable and ,theweight'of the Operating. lever 16 for this valve. i

The air and gas inlets at the {bottom of the stove are then opened andthe c0mbusti. ble ases are again delivered into the stove com ustionchamber where'they are burned I to again beat the stove checkerwork -tothe desh-ed high temperature. Thewaste' gases or roducts of-c'ombustionpass from' the com ustion' -chambethro gh -the -checkerwork andeventually-'pass into theatmosn' phere through thestack. 4, thestakfbeing of e height sufficient-to create the: necessary draftthronghthe Steve When the s tove checkerwork is; heated the cable 22 onthegend'ofthefcl i i and if necessary the cable is fastened to'hold thevalve in osed. postion until; the Qld-u are then tightly closed afterwhich the valve on the -cold-blast main is opened-to admit cold-blastinto the stove, the cold-blastpass ing into the stove through theelbowylO at I The valve on the hot-blast main' isthen opened so that the`air-b1ast as 'it becomes heated passes `from the stove into' thehotblast main and through the hot-bl'astmain to thebustle pip'epen-stocks and twyers, and finally into the blastfnrnace; The advantagesof myinvention, which will be readily appreciate' by those' skilled 'inthe art, arise from the novehembination 'and location of have beendes'cri ed, and which are articu larly pointed out in the appended eaims.

' Instead of having the' blow-ofl" or-air-relief valve at the bottom ofthe stove,' it opens into the stove 'stack or chimney, and as the top ofthb chimney extends fol' a -coniderable distance above the ground;level, the danger and annoy'ance caused' by the roar of the escaping airwhen relieving the'pressure in the stove is moved to a 'remote pointparts which are shown and 120 openin therethrough. 7 A'i where it is notheard, or at least is very indistinct. The liebility of injury toworkmen caused by the air-blast blowing cinder and other solids on theground adjecent to the bottom of the stove is cvoided and overcome. Bycombinin the air-relief valve and chimney valve, te cost of theapparatus is lessened because the number of parte is reduced.

Modificatons in the Construct on and arrangement og the parts may bemade without departin from my invention. So far as I am aware, l a'm thefirst to locate the blowofl' or air-relief valve of a hot-blast stove sothat it will discharge into the stuck of the stove, and I intend bocover such combinetion broadly. I

I claim 1. In the operation of hot-blast stoves, the step of directinginto the chimney of the stove the heated air under prcssure trapped inthe stove preparato-y to reheating the stove checkerwork.

2. In the operation' of hot-blast stoves, the steps of stoppin the blastheating op eration by olosng t e hot-blast valve and cold-blasts valve,and. then establishing a communication between the interior of the stoveand the chimne preparatory to reheating the stove chec erwork, wherebythe heated air under pressure trapped in the stove may escape into thechimney.

3. A hot-blast stove provided with a valve controlled outl'et 'formingmeans for directing into the chimney of the stove the heat- -ed airunder pressure trapped in the stove preparatory to reheating the stoveChecker- WOl'k. D j

. 4. A hot -blast stove provided with a chimney valve and also havingavalve controlled outlet formin means for directing into thc chimneyof estove the heated air under pressurex-t'ap ed in the stove preparatory toopeningt e stove chimney valve and 'eheatingthe'stofve checkerwork.

5. The combin'ation with a hot-blast stove, of a chimney'olofcommunication therewith during thefheating of air therein, and an airrelief OiltlBfi toestahlish communication between the interier of thestove and the chimney for directing into the .himney the heated airunder pressure trapped the stove preparatory to reheating the stovecheckerwork. 4

6. A hot blast stove provided with a chimney valve having avizive-controlled blow-'off ot blast stove'provided with a chin'- neyvalvehavingm blow-o& opening therethrough, a valve controllin the low-oiopening, and means accessib at the exteror of the stove for controllingthe' blowof volte'. M

8. A hot blast stove provided with a chinney yalve having e blow-offopening thanthrough, a* valve 'for controllin the blowofl' opning, achimney valve ever accessible from the tkterior of the stove, and ablow-off valve lever accessible at the exterior of the stove.

9. A combined chimnoy valve and blowofl' for hot blast stoves comprisina chimney valve provided .with a blow-o opening and e displaceahleclosure therefor.

10. In a hot-blast stove, the combinztion with a chimney connected totheinterior of the stove, and a chimney valve :for closin said opening,of a valve controlled blow-c opening located in said chimney valve andarrangecl to connect the nterior of the stove with said chimney..

11. In a hot-blast stove, the combination with a chimney connected tothe interier of the stove, and a chimney valve for closin said opening,of a valve controlled blow-o opening located in said chimney valve andarranged to connect the interior of the stove with sad chmney, and meansaccessible on the exterior of said stove for controlling said blow-offvalve.

12. n a hot-blast stove, the combination with a chimney connected to theinterior of the stove, and a chimney valve for closin said opening, of avalve controlled blow-o openxigdocatedin sai@ hinneyyalve and arrangedto connect the interior of the'stove" with said chimney, and meansaccessible on the exterior of said stove for positively moving saidblow-oil' va 1ve. i

13. In a hot-blast stove, the conibination with a' chimney connected tothe interier of the stove, and a chimney valve for closin :said opening,of a valve controlled blow-o opening located in said chimney valve andarranged to connect the interier of the stove with said chimney, achimney valve' lever and a blow-off level', said levers 'being acicessible on the exterior of said stove.

1% In a hot-blasts stove, the combinatio'n i i with a chimney connectedto the interior of the stove, and a chimney valve for closin saidopening, of a valve controlled blow-o opening located in said chimneyvalve and ::range-d to connect the interier of the stove] .2

with said chimney, a chiinney valve lever fulcrumed intermediate of itsends ad ex- V tending through -the wall of thechimney,

a link connection between the lever and the' chimney valve, a blow-offvalve lover ful- 4 crumed dh the chimney valve lever and ec oeesible onthe exterior of the stove, and s connection between the blow-o& valveand 15. In a hot-blast stove, the combination with a chimnev connectedto the interior of the stove, and a chimney valve for osin aid opening,of e valve controlled blow-o opening located in said chimney valve and`'arrangotl to connect the interiorof' the stove with said chimney, achimney valve lever t i r mase-c ulztruned intermediate of its ends 'andex tcnding through the wall of the chimney, a link connection betweenthe lever and the chimney valve, a blow-ofl' valve lever fulcrumed uponthe chimney valve lever and accessible en the exterior of the Steve, alink connection between the blow-off Valve and its lever, a bracketcarried by the chimney valve leverg a weighted lever mounted upon thebracket', ende link extending between the Weighted levf'nd the blow-offValve level'.

16. In a hot-blast Steve, "the cemhination with a chimney connected tothe interier of the stove, and a chimney valve for clesing said opening,of a valve controlled blow-Ott' opening located in said chimney valveand arranged to connect the interier of the steve with said chimney,means for. openingthe blow-off valve, and means for yieldably maintaininthe blow-ofl' valve seated.

17. In a ot-blast steve, the celnbination with a chimney connected tothe interier of the stove, and a chimney valve for closin said opening,of a valve controlled blow-o opening located in said chimney valve endarranged to connect the interier of the stov'e with said chimney, meansfor opening the blow-Ott valve, and yielding means for automaticallymoving the blow-off valve into closed position.

18. In a hot-blast stove, the combination with a chimney connected tothe interier of the Steve, and a chimney valve for closin said opening,of a valve controlled blow-ofopening located in said chimney valve andarranged to connect the interier of the stove with said chimney, a leverfor opening the blow-off valve, and a tension device associated with thelever for yieldably maintainin the blow-off valve in closed position.

19. n a het-blast Steve, the combinatien with a chimney connected te theinterier of the stove, and a chimney valve fer closing said opening; ofa valve controlled blow-eli opening located in said chimney valve andarranged te connect the interier of the stove With said chimney, let-erfer opening the blow-oil` valve, and a tension device zsso-- cated Withthe lover for vicldnhly znnintuining the blow-off valvc clos d, szi l'tension device including a veightctl leve-r 'eunted independently ofthe blowmfi velre lever and connected thcreto.

20. In a hot-blast stove, the ce nbinatien with a chimney connected tothe interier of the Steve, and a chinney valve for ::losing saidopening, of a valve controlled 'blow-oti' opening located in saidchinney valve and arranged to connect the interier of the store withsaid chimneye chimney Valve lever fulcrumed intermediate of its ends, ablowoff valve lever fulcrumed at one end to one end of the chimney valvelever, said level-s rojecting outwardly through an opening n the wall ofsaid chimney, and Operating means connected to the outwardly projectingends of said levers.

' 21. In a hot-blast Steve, the combination with a chimney connected tothe interier of the Steve, and a chimney valve forclosin said opening,of a v alve controlled blow-o opening located in seid chimney valve andarranged to connect the interier of the Steve with said chimney, achinney valve lever fulcrumed intermediate of its ends, a blowoff valvelever fulcrumed at one end to one end of the chimney valve lever, saidlevers rejecting outwardly through an opening n the wall of saidchimney, valve clesing means connected to the eutwardl projectin end ofsaid chimney valve p ever, and va ve opening means connected to theoutwardly projectng ends of said blow-oli valve.

In testimony whereof I have hereunto set m hand.

y THOMAS L. DONAHIE.

